Any one piece base that works on a 700sa will works on a seven
This is correct.
The rear hole on the Model Seven (the only hole on the 3-holers) aligns at the same distance as the front hole of the 700. If you look at the Leupie stock numbers, the XP100 and Seven bases are actually the same numbers as the 700SA. This all applies only to one-piece bases, of course.
